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. 2001 Feb 1;106(1):105–149. doi: 10.6028/jres.106.006

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The Journal of Research of the National Institute of Standards and Technology is a publication of the U.S. Government. The papers are in the public domain and are not subject to copyright in the United States. Articles from J Res may contain photographs or illustrations copyrighted by other commercial organizations or individuals that may not be used without obtaining prior approval from the holder of the copyright.

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Fig. 9 — An SPRT in an indium, tin or zinc freezing-point cell. A—SPRT; B—to helium gas supply and pressure gauge; C—thermometer/helium gas seal with silicone rubber; D—silicone rubber stopper; E—thermal insulation (Fiberfrax); F—thermometer guide tube [precision bore tube, ground (matte finish) to uniform outside diameter]; G—heat shunt (graphite) in close contract with F and with H; H—borosilicate glass cell (holder) [precision bore tube, ground (matte finish) to uniform outside diameter]; I—graphite lid (cap) for the graphite crucible; J—graphite thermometer well; K—metal sample; L—graphite crucible; M—thermal insulation (Fiberfrax paper) between the graphite crucible and the borosilicate glass holder.